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(No Model.) I Z. T. FRENCH.

SOLE SEWING MACHINE. No. 317,758. Patented May 12,1885

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UNITED drrns Farmer much.

ZAOHARY T. FRENCH, OF BOSTON, MASS, ASSIGNOR TO THE GOODYEAR & MCKAY SEWING MACHINE COMPANY, OF HARTFORD, OONN.

soLE sEn/me MACHINE.

SPECIFICATION forming part of Letters Patent No. 317,758, dated May 12, 1885.

Application filed October 27, 1884. (N model.)

To all whom it may concern.-

Be it known that I, ZACHARY T. FRENCH, of Boston, county of Suffolk, State of Massachusetts, have invented an Improvement in Sole-Sewing Machines, of which the following description, in connection with the accompanying drawings, is a specification, like letters on the drawings representing like parts.

This invention relates to that class of solero sewing machines adapted for sewing welted work, and has for its object certain improvements in mechanism through or by which to lock the table or work-support with greater accuracy than heretofore.

I 5 Figure 1 in side elevation represents asufficient portion of a sole-sewing machine of the Goodyear & McKay class to illustrate my improvements. Fig. 2 is a partial side elevation of the lever and pawls of the table-lock- 2o ing device, and Fig. 3 a left-hand end view of Fig. 2.

The frame A, main shaft A therein, cam B, carriage B, presser-footfl, channel-guide 0, table or work-support D, table-depressing lever D, operated by the spring D and the lock-slide a are all substantially as common to the said machine. Heretofore this lockslide has been held frictionally while the usual curved needle (not shown) enters the material to take the thread for a stitch; but in practice holding the slide by friction has been found to be objectionable, for the pressure of the channel-guide and needle on the stock as the needle enters the latter is sometimes sufficient to overcome the frictional hold on the slide and permit the table to descend, breaking the needle.

To obviate slipping of the lock-slide I have provided it with a series of teeth,made prefer- 0 ably in a steel plate, 11, the said block being attached to the said slide preferably by placing the said plate in a groove in the slide a. The lever H, pivoted on the bolt h, and provided with a roll, it", and held up by a spring, ]L3, is

acted upon by the cam B, which depresses the rear end of the said lever at all times when the locking-slide should be free to moveas, for instance, when the feed is taking place or as the work is being put in place or removed.

The forward end of the said lever H, or, as it may be called, pawl-carrier, is provided with two gr'ooves-one at each side of the lever-to receive the two pawls c c,having a common fulcrum, cfland acted upon, respectively, by the two springs d (1, held in place by the screws d (P, a screw, d, holding the fulcrumpin 0 in place. One of these pawls-viz., the

one c is longer than theother one, 0, (see Figs. 2 and 3,) and the grooves in the lever to receive the pawls are of different pitch, the one which receives the shorter pawl, 0, being the steeper, so as to permit the point of the said short pawl to fall a little to the rear of the point of the long pawl, so that when the lever is acted upon by the spring hito depress its front end, one of the said pawls will enter well down into the notch between twoteethpf the plate I), and the other will rest on the slanting side of one of the teeth forming one side of the said notch. In Fig. 2 the longer pawl, c, has entered into the bottom of the notch,while the shorter pawl rests on the back of one of the teeth of the plate. Making these pawls of different lengths and holding them in the lever so that their points fall one behind the other enables the teeth in the plate b to be made much closer together or finer than were only one pawl used,or were the points of both pawls in exactly the same line, the finer teeth permitting finer movements of adj ustment,and 8O consequently enabling the table to adapt itself more nearly to the exact requirements of the stock being operated upon, the teeth and pawl also, enabling the slide a and table to be locked positively in exactly the proper place while 5 the stitch is being made, thus avoiding all liability of the table to yield from any cause.

In the old form of machine,wherein the slide was held frictionally, a very strong spring had to be used, and very considerable force was 9 required to overcome its pressure; but herein the spring it is made very slight, merely sufficient to keep the roll 7r against the cam B, and the power required to operate the machine is very materially lessened. The pawls are made double, so as to be reversed when worn or injured.

In the foregoing description Ihave described the employment of two pawls, and each oneis controlled by a spring; but I desire it to be understood that the employment of one pawl, and that a rigid pawl, connected with the lever H and engaging the teeth of the lockslide a, would, I deem it, come within the scope of my invention.

1 clain1- 1. Thepivoted table or work-support D and the toothed slide a, with which one end of the table is connected loosely, as described, combined with the lever and a pawl carried by it to engage the teeth of the said slide all to operate substantially as described.

2. The table or work-support and its connected slide provided with teeth,as described, combined with the two pawls having their 15 points one back of the other, to operate substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two'subscribing witnesses.

ZAOHARY T. FRENCH.

Witnesses:

G. W. GREGORY, B. J. NoYEs. 

